"Thank-you so much for coming so swiftly on such short notice, Twilight." Celestia smiled, leaning down to hug the younger mare.
Twilight giggled. "Well your letter did say 'as fast as convenient'. So what's the problem? Diplomacy troubles? Another Tartarus breakout? Discord?"
"Oh gracious, no, Twilight," Celestia smiled, and began to lead her out of the throne room. "This is more a sort of internal affair. Luna and I have been... discussing a lot in recent months. This concerns you, and Cadance, and we both feel that now is the time to bring something to your attentions."
"Oh, is Cadance here too?" Twilight's step grew springier as she followed her old mentor.
"Yes, Luna is entertaining her and little Flurry Heart in the private lounge."
Celestia looked back at her ex-pupil, took in her expression, and gave a soft laugh. "Oh Twilight, you're not in trouble! If anything, this is a positive conundrum."
Twilight blinked, pausing in her stride for a fraction of a second. Then she nodded, and the two alicorns walked on in silence. As they finally approached the door to the Princesses' personal lounge, a faint murmur of voices could be heard. None of the words were clear, and Twilight had long suspected that there was some sort of subtle obscuring enchantment on the door. It discouraged casual eavesdroppers, at least.
From the tone of the voice, Luna was regaling Cadance with some ancient tale. There was the odd sharp cry which might have been Flurry Heart's laughter. Twilight looked up at Celestia, who nodded, before twisting the door handle in her magic and entering the room.
Cadance was reclining on a couch, her daughter cradled between her forehooves. Flurry was wriggling and giggling, and both of the pink alicorns were looking at Luna, who was standing on the arm of a second couch in a dramatic pose. One of her forelegs was raised, her chest was pushed out, her wings were flared, and she was staring up intently with her ears confidently pricked.
"It was on that day that the world no longer knew fear from the name Noodle Incident, and he remains locked in the bowels of Tartarus to this very day!"
Cadance applauded using Flurry Heart's hooves. Luna's ears twitched towards the door, and she turned her head to see Twilight and Celestia. She lowered her foreleg and hopped down from the couch arm with a dignified grace.
"Unless, of course, my dear sister decided to release him for one of her reformation projects in the interim?"
The oldest mare in the room laughed, shutting the door behind her with a quiet click of the latch.
"Do not worry, Luna, that is one particular villain I would prefer to never see again. Now, we're all here. Everypony, please take a seat."
Cadance sat up on the couch, scooching over and patting the cushions for Twilight. The two alicorns shared a brief hug and a coo over the baby. Luna reclined on the furniture she had recently been using as a stage, and Celestia took up a third, larger couch all to herself.
"So by now, you're probably wondering why we summoned you-" Celestia began, but Luna waved a hoof at her to stop.
"Celestia, you are using your headmistress voice again," Luna flicked her head and sent her mane rippling. "May I take the lead this time?"
When Celestia nodded, the dark princess smiled. "Excellent. Now, my young friends, this is a matter concerning who and what we are. That is, the five of us in this room. Or it might be more accurate to say the three of us, and the two of you."
As she spoke, Luna gently took Flurry Heart in her magic and brought the foal close to her face. She nuzzled the filly with an indulgent smile, and then sent the foal back to her mother.
Twilight tilted her head. "I don't understand, we're all alicorns, aren't we?"
"Are we?" Luna shared a sad smile with her sister. "You see, dear child, you and Cadance were not born alicorns. Therein lies the start of our problem. You earned your powers and your titles through bringing about new magic, and ascended from mere mortals to what you are now. However, you are still mortal. You will have longer lives than most but you will still age and die. Celestia and I, and now young Flurry Heart, we will not. When Flurry grows up, when she assumes her place in the world, she will become like us - ageless."
Twilight and Cadance glanced at each other, and then down at the little foal who was gumming at Cadance's left shoe. Cadance swallowed. "So... Flurry is going to live forever? I won't say I'm not relieved. I think every parent probably wants a guarantee that they won't outlive their children. I... Why is that a problem?"
"Oh, no, Flurry's situation is not the problem. In fact it is a blessing! No, no, our problem is you two. You two and your lack of immortality. Celestia and I think we may have a way to ascend you further, to make you like us."
"You mean, we wouldn't die?" Cadance's eyes darted between the sisters of the Day and Night. They nodded, and Celestia gave a small cough. The white alicorn's smile turned grave.
"Of course, this is not a decision to be made lightly. The method we think we have... it may not work, it is only theoretical at this point. If it does work... you will have the rest of time to contend with. I reccommend that you take some time to think about this. Do not rush into it. Take as long as you need - weeks, months, years even. Talk it over with your friends and family. Ask us whatever you want to know."
"Why do you want to make us like you?" Cadance questioned, almost immediately.
The sisters shared a solemn look. Luna spoke. "Partly because we think that Equestria will be that much richer for Love and Friendship to be embodied forever, and partly because we are selfish creatures who want more company over the eons."
"I love you both like my own foals, Cadance, Twilight," Celestia continued from Luna's words. "I want to see what both of you would become. This will not be our choice, because we are not unbiased. You do not need to justify any of your reasonings to us, and you may back out at any time before the further ascension even if you initially said yes."
"Wait," Twilight rubbed her hooves together. "You said you were born as alicorns, like Flurry. Is, I mean, um, I mean, your parents. Were they, erm, alicorns too? Like Cadance and I? Or just one of them? Or?"
"Indeed, Twilight. Our parents were ascended alicorns. We believe that they were the first," Luna's eyes drifted upwards, as if remembering the past. "They are well known in history, though knowledge of their transformations and their parenthood of alicorn foals was scrubbed from most known history."
"What? Why? Who were they?"
"They did not want our rule questioned by ties to the blood of common ponies. We were brought up within a small, peaceful community, away from the troubles of the world. Our parents had grown up in a world before Equestria, you see, before Hearthswarming. They had lived through the onslaught of the Windigoes. When they ascended, it was taken as a sign that the unity between the tribes was true. The actual country wasn't founded officially until I was five years old.
The leaders of the tribal factions were among the few that knew of us, and when we were born it was decided that we were to be instated as the new rulers of the new society when we were of age. A pair of ponies who embodied all three tribes in one. So we were introduced upon our adulthoods to the world, as harmonic beings from a dimension made of magic. The leaders bowed to us, and then so did their ponies. Soon after taking the thrones, we discovered our twin abilities in moving the lights of the sky, and our positions were sealed."
"Wow. so your parents were just... ordinary ponies? What did they do to ascend? Both of them?"
Celestia gave a small chuckle. "Not quite ordinary, Twilight. In their day, I suppose they were the Alicorns of Friendship. They didn't get titles, everypony was too confused. All three of them ascended together."
"Three?" Both Twilight and Cadance tilted their heads in synchronised confusion.
Luna gave an amused snort. "Oh, now let us stop being so cryptic for once. You two of all ponies are worthy of our secrets. Children, our parents were Clover the Clever, Smart Cookie, and Private Pansy. The creation of the Fire of Friendship also ignited their full potential and ascended them that day in the cave."
Twilight's eye began to twitch. "Clo- what? Pans-Smar-? Your? Huh?"
Cadance's ears had pricked up. "Smart Cookie was your father? Are you half-sisters? I didn't even know any of the founders had relationships with each other."
"Clover the Clever, Smart Cookie and Private Pansy began a herd marriage during the formation of Equestria proper," recited Tilight, instinctively. "They went on to have four children in total. Creek the Crafty was their eldest, and daughter of Clover. She went on to be a well-renowned earth-pony scholar who helped Starswirl the Bearded with a lot of theoretical magical discoveries. His notes about her say that while he had at first been skeptical when she began to criticize a few of his methods, he would have taken her as one of his last apprentices had she been a unicorn like her mother.
Pansy then produced twin sons, both pegasi. Tough Cookie joined the early EUP and while he never made Captain status he was always relied on for advice and served as second-in-command for thirty-eight years under three different Captains. Heart's Ease was the younger twin and gained a reputation for being a mare's stallion in his youth. He later settled down with one of Princess Platinum's daughters and had many foals who would go on to found some of the earliest noble houses.
Finally, Sweetgrass Star was Clover's second foal and the youngest the herd had. She was a unicorn who joined the military after her brother and became one of the military doctors. She invented a number of minor healing spells that are still used today but never had the magical genius to study under Starswirl."
Twilight blinked. "Wait, you two had siblings?"
"Ah, do you remember when Swee was born, Celestia? She was so tiny!"
"I remember all of you being born, Luna. The boys were definitely the tiniest."
"Hah, and they grew up to be the tallest! Excepting you, perhaps. I... wonder what they all would have thought about what has happened overe all of these years."
Twilight whimpered slightly, breaking the elder alicorns from their reverie. "B-but? All my books have lied?"
Cadance patted her on the back between her wings. "This is... an interesting new perspective. So it was only you two who were born with horn and wings?"
"Yes. While we only have a sampling of two, ah, now three, it seems that only the first child of an ascended alicorn will be a nascent one."
Cadance's eyes widened. "So... any future foals I might have... they would be mortal?"
A nod in response. Cadance looked down at her daughter, biting her lip.
"So if I want to have foals... my first foal will be an alicorn? Oh goodness," Twilight chewed on her hoof. "Oh goodness."
She fixed Celestia with a panicked stare. "What about you? I mean, have either of you? Er. Had foals?"
"I have not," Celestia looked away for a second, choosing her words. "It may be that I can not."
"Oh."
"I, on the other hoof, have not attempted to bring about motherhood," Luna sniffed and gave a little shudder. "I like foals, and I like the idea of them, but for some reason the thought of growing one inside me fills me with an inexplicable dread. It has since I first learned the full mechanics of making offspring. I am content to consider our people as my surrogate."
"Ah," Twilight squirmed. "I'm sorry, I didn't mean to bring up anything weird or-"
"Twilight, relax. This is the sort of thing we were expecting you to ask. If you ever want foals - consider that ascending to immortality may take that option away from you. Again, you have years to consider your answer. Your whole lifetime, should you wish it."
The room lapsed into silence, and all of the mares looked at Flurry Heart.
Cadance was first to break the quiet. "If you don't mind, I would like to go home and talk to Shining about this, and send you a list of questions once I have had the time to think on this more."
Celestia slid off of her couch and stood up. She stretched her large, white wings out and walked to Cadance with delicate steps.
"That sounds like an excellent idea, Cadance. Writing down your thoughts can have a wondrous effect on untangling them."
The tall mare leaned down to peck Flurry on the forehead beside the horn, and then wrapped Cadance in a one-legged hug.
"Take care, Princess Cadance," Celestia turned her head to look at her ex-student. "What about you, Twilight?"
The purple alicorn started, and looked at Celestia for a few long seconds. "Oh, um. I might do the same. I mean, go home and talk to Spike and my friends. Not Shining. Maybe Shining?" Twilight glanced at Cadance. "I'll send a letter? Then writing questions for your letter. Then... thinking."
"A most promising plan, dear ones, we will be looking forward to your missives," Luna waved from her couch. "Forgive me if I do not arise to send you off, but this couch is comfortable, Celestia gives better hugs than I, and I am overdue a nap."
Luna promptly set her head on her hooves and closed her eyes. Celestia embraced Twilight briefly. As Twilight left the room, she could see the white alicorn beginning to levitate a blanket over her younger sister with an indulgent smile. There were still questions spinning about in her head, but first she was going to make a list. Cadance was waiting for her outside the door, her daughter perched and burbling on her back. The two younger alicorns set off down the corridors together in companionable silence.
Before they opened the palace doors, Cadance held up a hoof and turned to her sister-in-law with a smile. "I'm going to fly back to the Empire now, Twilight, any messages for Shining?"
"Tell him he's a dork and he should visit sometime," Twilight smiled back. "Do you have any idea what you're going to do?"
"I think... I want a family first, Twilight. But I also don't want to see them pass on while I never age. If we knew for sure if I could have foals or not as a full alicorn, and what they would be... I don't know. If I ever do decide to go for it... I don't think it will be for a long time. That's all I can say right now. What about you?"
"No idea. There are a lot of things to consider."
The mares nodded together, and Cadance pushed open the doors. "See you soon, Twilight."
"See you soon, Cadance."
The pink alicorn spread her wings and flew away.
Author's Note
So... this idea has been chewing away at the back of my mind for a while now, but recently it's to the point where it's blocking any work on Asiren. 
I know the whole 'what if immortality' thing has been done a million times before but I wanted to write it out myself.
There should be one more chapter after this which is about maybe half-written, unless I need to break it up from length. Not sure how many words it's gonna take up by the end. 
So, what do you think Twilight and Cadance are going to do? What are the others going to say? What would you ask the Two Sisters?
Let me know if there are any glaring errors/typos and the like! 
I'm not sure about some of the more exposition-y bits. Too much?
Somehow, Pinkie Pie had known exactly when Twilight would return. There was probably a Pinkie-Sense twitch that said incoming party, or some sort of sign from her cutie mark like a call from the Map, but Twilight had never asked exactly how she did it. One extensive delve into the magics of the pink mare had been enough for Twilight's sanity for one lifetime. If she had more than one then maybe...
In any case, as soon as Twilight had trotted in through the doors, Starlight had been waiting for her.
"Hello Twilight! How was your trip to the Princesses? Why don't you tell me in the dining room?"
Twilight grinned. "I hope it's chocolate cake, I'm really in the mood for that."
Starlight deflated. "It's supposed to be a surprise 'I Sure Hope No Big Problems Have Come Up' party. None did, right?"
"No, we just had an... interesting chat. They're in the dining room, you said?" Twilight began down the hall, eyeing Starlight briefly. "Say, just a quick question - if you were offered the opportunity to become immortal, would you take it?"
"Sweet Celestia, no," Starlight snorted at once, before her eyes widened and she stopped in place. "Is that what you were called about? They can make you immortal?"
"Sort of," Twilight waved a hoof vaguely. "Why would you say no?"
Starlight's gaze drifted to the side and hardened. "I don't do well with power. It's just... look what I did with just one small village under my hoof. I don't want that to ever happen again. So I would say no. I know I can't be trusted with something like that. All of those ponies looking up to me, it would be nice again, but I know I'd slip back into my old ways and start taking away freedoms under the guise of helping others again. You, though, would be much more responsible with it I'm sure."
Twilight hummed to herself and the pair resumed their pace.
It wasn't the response she had been expecting. Twilight supposed it was also a better one. Could she be trusted with the future of Equestria? Would she be responsible enough? Sure, she had embraced her current duties, but in the future would she be able to handle it? If she accepted, then her very presence would affect the world over time whether she wanted it to or not.
Ponies hung on the Princesses' every word. Twilight couldn't count how many times she had seen them bowing and scraping at Celestia's hooves, no matter how many times she attempted to gently dissuade them. Ponies who dealt often with royalty soon overcame their first, awed instincts, but across Equestria the very idea of meeting with one of the alicorns sent most of them into at least a mild worship-induced-panic.
Using Celestia's name like Starlight had was not an uncommon occurance, now that Twilight was thinking about it, and since Luna's return, similar phrases had been uttered about the Moon Princess. She hadn't heard anypony exclaim on her name, yet, but would she be okay with it if they did?
Do I want to live forever? Twilight asked herself. She wasn't sure.
Starlight stopped her with a hoof before the doors to the dining room. "Remember, surprise party."
Twilight nodded with a soft smile and pushed open the door.
After assuring her friends that all was well in the world, engaging in several heated rounds of Pin-the-Tail-on-the-Pony and a spectacularly explosive piñata disembowlment, Twilight had taken a generous slice of the (deliciously chocolatey) cake and retreated into a quiet corner. Applejack and Rainbow Dash were still arguing about who had won the round, and Pinkie had gone off in search of a ruler to straighten the matter out. Starlight was chatting to Rarity and Fluttershy, while Spike was attempting to snag more of the piñata's scattered sugary entrails from beneath the table spread with party food.
There was the aforementioned chocolate cake, a multi-tiered mass of blissfully light and fluffy sponge, the layers split by generous helpings of white chocolate buttercream. The whole thing was slathered in a mirror-like dark chocolate glaze. Carefully done piping across the top had once spelled out Good Thing the World Isn't in Danger Again, Please, but since the girls had fallen on it the only words left were World Danger Please. Twilight that she might go back and snag Danger once she was finished with her first slice to try and head off the inevitable whims of Fate soon. Around the cake, there were a selection of sweet and savoury dishes all brought by her friends for the party. An empty plate bore the only remaining crumbs from Applejack's classic fritters, and Twilight suspected that the comparatively less-touched salad had been provided by Rarity. In and amongst the veritable feast, though, sat one plate that probably didn't qualify as food.
Where in Equestria Pinkie had managed to find a jelly mould shaped like Twilight's own face she wasn't going to ask,. The party pony might have made it herself for all she knew. Nopony had gone near the luridly violet mass, and it wobbled aggressively even from across the room. Upon questioning about the flavour, Pinkie had shrugged and muttered something about grapes and the Everfree Forest. Twilight snickered as she forked a bite of cake into her mouth. If she said no to the Princesses' offer, that jelly might just outlast her.
Ah, the Princesses' offer.
Twilight's smile dropped away, replaced by a light frown.
Celestia had said that she would have years to decide on the right course of action. Coming up with an answer, however, happened to be a problem, and problems needed to be solved. She planned on visiting each of her friends in the next few days to discuss it with them, but for now she was alone with only Starlight's aggressive rejection of the idea.
"Are you okay Twilight? You have too much cake?"
Twilight blinked and found herself staring at her fork. She gave a little snort, and then looked down towards the source of the voice. Spike stood there, with an armful of fallen goodies and a raised eyebrow. Twilight smiled and shook her head.
"I'm fine Spike, I just have a lot on my mind," the purple alicorn took another bite of the cake to prove it. "Celestia and Luna asked Cadance and I a question. A big question. I'm not sure how to answer it yet."
"Oh," Spike picked through his hoard of Dental Problems Yet To Be and found a lollipop. "What is it, like, math? Really complicated math? The most complicated math ever and you have to do it all in your head?"
"Not... exactly. What would, um, what would you do if somepony offered you immortality?"
Spike tilted his head. "I'm a dragon, we kinda live for thousands of years. It's practically a given, anyway. Hold on, is that the question they asked?"
"Yep." Twilight scraped some of the frosting from the top of the slice onto her fork and ate it.
"Is that the kind of question you can say yes to, not hypothetically?"
Twilight nodded, her mouth full of frosting. To her surprise, Spike's eyes filled with tears, and he dropped his load of sweets to throw his arms around her neck. She whinnied in confusion and the dragon began to sniffle.
"S-spike?! What's wrong?"
The words were barely audible against the fur on the side of her neck. "If you say yes, I won't be alone."
"Oh, Spike." Twilight pulled him closer for a proper hug. Once he'd stopped sniffing, she kept one hoof on his shoulder and looked him in the eyes. "Spike, whether I say yes or not, you won't ever be alone. You'll have Princess Celestia and Luna, and Flurry Heart too. Lord Ember and her dragons will be there too, don't ever forget that, okay?"
Spike nodded, and rubbed at his eyes which were still a little watery. He breathed deeply for a few moments, then he leant down to retrieve the sweets and scurried away.
Twilight let out a long, shaky breath and set her plate down on the nearest table.
Guilt washed through her barrel, sending sick waves lapping up her throat and squeezing her heart. The thought that Spike having a draconic lifespan and living so long past her and all of her friends hadn't even occured to her before today. She hadn't ever considered it, but clearly it was something that her Number One Assistant had been thinking about. Oh goodness, was this something similar to how Cadance must be feeling about little Flurry Heart? There was a heavy, cold weight settling in Twilight's stomach. If she said no, then poor Spike would be devastated, but...
She couldn't just say yes because of one individual, could she? Would it be selfish, to ask to become immortal just to spend more time with her favourite dragon? Would it be wrong?
"Twilight, darling? Are you okay? You look to be in some distress." Rarity called across from her conversation, and all of the heads in the room turned to stare at her. Starlight raised her eyebrow and Fluttershy looked concerned. Rainbow and Applejack were standing near a returned Pinkie Pie who was holding a ruler to the Pin-the-Tail board. There was no sign of Spike, as he'd probably taken his spoils back to his room. Twilight froze for a second before clearing her throat and giving them all a sheepish grin.
"Oh, sorry girls, I think I have a headache coming on. The party is great but I think I'm gonna head to my room and get an early night."
Her friends all offered her their sympathy, and Twilight left them to clear up the room once she had been assured that she did not have to help. She hadn't really got a headache, or at least not a physical one, and felt a little bit bad for just skipping out on them all. Twilight wanted to sleep on her thoughts before asking the rest of her friends for their opinions.
She was meeting Rarity and Rainbow Dash for lunch tomorrow at Sugarcube Corner, so she would probably get three different views at once. A nice, healthy portion of debate was sure to spark up more aspects of the decision that she had yet to take consideration of.
Twilight yawned. Well, no use in wasting the extra time she had for sleeping on more thinking. That could come tomorrow.
The scents of the bakery were delectable as Twilight Sparkle pushed open the partitioned door to Sugarcube Corner. Lunch time was busy time, and so it meant that all of the smells from the freshly baked and currently baking products were at their highest concentrations. The alicorn could smell apples, cinnamon, lemon, chocolate, flour, yeast, and that sort of sweet egg-like flavour that hot sponge cake exuded. Her stomach rumbled in appreciation, and Twilight glanced around until she located the table where Rarity and Rainbow already sat. From what she could see, they were engaged in a friendly bicker over something on the menu.
To prepare for the lunch, Twilight had eaten a light breakfast - two slices of buttery toast and a glass of orange juice. Her stomach rumbled again, and she scurried over to her friends' table and sat down a little too roughly, a few of her feathers askew.
"Oof," Twilight fidgeted slightly to try and get into a more comfortable position. She looked up at Rarity's concerned cooing and grinned. "I'm not late, am I?"
"No, not at all, darling! In fact, you're right on time in order to settle our little debate," Rarity snatched the menu from Rainbow Dash in her magic, elliciting a yelp of protest, and flipped it open to one of the pages. "Dear Rainbow seems to think that, of all things, pancakes are the ultimate breakfast food. I shall not stand for such taste."
Rainbow snorted. "Rarity isn't even arguing for waffles, though. I mean, I could see her point if she was going for them 'cause that's, like, the eternal debate, right? Pancakes versus waffles? But nooooo. Rarity's saying cereal."
"Oh," Twilight floundered for a moment. "For the record, I think the concept of breakfast-specific food is kinda silly. Why you can't eat one kind of food at a certain time of the day... it's pointless! So I'd say something like a Full Wingland, but less... fried. As for cereal and pancakes? Sorry Rarity, but I have to go for pancakes."
Rainbow threw her hooves up in the air in triumph. "Ha, Princess Egghead agrees with me!"
"Pah, fine. I'm surrounded by the uncivilised," Rarity turned up her nose, but there was a glitter of amusement in her eyes. "Well, enough of that, let us order our lunch!"
"Aw yeah, I know what I'm getting." Rainbow yanked the menu back and flipped a few pages forward. She pointed to her selection eagerly.
"Slice of Cider? Oh, must be some new apple cake thing," Twilight peered over her blue friend's shoulder. "'A generous slice of sweet apple and cinnamon sponge cake, filled with a caramel buttercream and shot through with genuine Sweet Apple Acres Cider, sourced locally. Optional hot caramel sauce drizzled upon request.' Gosh, that sounds fantastic, I'll have one too."
"Mm, I'll bet Pinkie had a hoof in the description." Rarity giggled.
"I sure did! Are you ready to order?" Pinkie seemed to emerge from beneath the table, drawing out two squeals of surprise and one definitely-not-a-squeal-do-you-have-a-problem-with-that-bucko from the three ponies sitting there.
"Goodness, Pinkie Pie, you gave us a fright, startling us like that!" Rarity ignored Rainbow's assertion that she had 'totally not been startled, she just happened to make a noise at the same time the other girls had been startled, that's all'.
Pinkie just grinned. "So whaddya want?"
"Ah, two Slices of Cider, and one Lemon Drizzle, if you would."
"Okie-dokie! Hot caramel with the Ciders?"
Twilight shook her head, Rainbow nodded. Pinkie beamed and bounced away to the counter to relay the orders to the Cakes. There was plenty of the Lemon Drizzle in the display case, but as the apple-flavoured cake was new, it was selling out fast. Pinkie grabbed one of the Drizzle cakes and a fork and hopped back on over to the others with it balanced on her back.
The pink mare slid the cake over to Rarity, and slid herself into one of the empty seats. "Is your head feeling better now, Twilight?"
"What?" Twilight had almost forgotten about her excuse from the night before. "Oh, yeah, headache's all gone."
"Oh, good! I've still got some of that cake left in one of the store rooms if you want to take some with you after this!"
Twilight smiled. "I just might, Pinkie, I'm sure Spike wouldn't mind another helping of it! Say, you girls, I have a question for you."
All three mares perked their ears. Twilight took that as a sign to go on. "I'm just wondering, if you were ever given the option to live forever, what would you do? Would you say yes or no?"
"Is this immortal as in, like we are now, or does it come with a pair of wings and a horn?" Pinkie tilted her head.
"Uh, yeah, you'd be an alicorn. I guess."
"Then, like, duh! Of course I would! Think of all the parties I could throw with the power of an alicorn and all of eternity!" Pinkie's eyes grew as wide as saucers. "I could make friends with everypony."
"Oh, indeed! The ponies you'd meet! The sights you would see!" Rarity dug her fork into the yellow cake in front of her. "The exotic cuisines! Why, you would never have to worry about fitting in the time to go visit some faraway land like you've always dreamed - because you wouldn't have the limit of old age to hold you back."
Pinkie nodded along, her mane bobbing wildly. "There would be so many friends, you'd never run out! New ponies to meet around every corner, and if you just wait a while, look! Even more! Saying goodbye to old friends would be sad, but I'd hope they'd all be happy that you remember them and that you can find new ponies to be friends with. "
Rarity giggled. "Why, seeing how things change over time would be amazing. I would love to see how fashion evolves over the centuries with my very own eyes! In fact, given the nature of the influence that an immortal alicorn has, I would be able to influence fashions myself for eons! Ahem, not that I would take advantage of that influence... too often, anyway."
"Wow," Twilight blinked. "That's a lot of... positives!"
"Oh, speaking of," Pinkie jumped up and waved at the counter. "I think your cake is ready, be right back!"
Twilight mulled over the responses. Both Pinkie and Rarity seemed to hold the potential experiences one might have as an immortal in quite high regard. The purple mare looked over at Rainbow Dash, who had yet to chime in. The pegasus had an unusually strong look of concentration on her face. Twilight shrugged and looked eagerly towards Pinkie and her rapidly approaching slice of cake.
The discussion was temporarily hushed as Rainbow and Twilight dug into their cake with relish. Pinkie had poured Rainbow's caramel on with a practised flourish, and hopped away again for another moment to return the small pouring jug to the counter.
"Mmmmoh my gosh," groaned Twilight. "This is so good."
Her stomach growled in approval.
"It apple-lutely is!" Pinkie snickered. "Me and Applejack came up with it last time I was running the store. She had some apples and a barrel of cider, I had all of the cake ingredients and a new caramel recipe... next thing we know, the Cakes are begging for the recipe and Slice of Cider was born."
"I'm going to marry you and Applejack." Twilight savoured a bite in her mouth.
Rainbow briefly surfaced from her slice. "Ditto. Think you can get the papers sorted for next week?"
"I can get them done tonight." Twilight's eyes took on a manic gleam.
Pinkie snorted. "I think you might need to ask us first, and I want to set a date in Spring."
Rarity eyed the cider cake. "I'm beginning to think I missed out on something."
In response, Twilight levitated a forkful into the unicorn's mouth. There was a minute of slow chewing and bated breath.
"I'm designing the dresses in my head right now."
A chorus of giggles rolled across the table.
"Okay, okay, the cake is the best thing I've ever tasted but Rainbow hasn't answered my question yet." Twilight set an expectant gaze across to the pegasus, who tried to wipe caramel from her muzzle unsuccessfully. Rarity began to dab her with a napkin, and Rainbow's face scrunched up in thought again.
"Nah," she said at last. "I wouldn't go for it."
"Really, darling?" Rarity's ears flicked. "I'd have thought that you would love the power of an alicorn at your frogs."
Rainbow let out a huffing breath. "I've said it before - I don't want to be a princess. I want to be a Wonderbolt. I am a Wonderbolt. I'm living the dream right now. Sure, I'm the rookie of the team at the moment, but I know that I'm gonna be the best, one day. Hay, I'm already breaking records. Where I am right now? Nope, I wouldn't take it."
"But Dashie," Pinkie prodded her with a hoof. "Wouldn't you want to be the best at flying forever?"
"What? No!" The other three mares drew back slightly.
"I mean, no, of course not. I really want to be one of the best, maybe the best there's been so far, but I don't want to ever be the best forever. What about all the ponies who come after me, who want to be the best at flying there's been yet as much as I do? The next Rainbow Dash? I don't want to steal that from them. I hate losing, but I have to lose eventually, or no one else would ever win and no one else would ever try to win ever again, and that would be, like, the worst thing. 'Cause then what's the point of winning? You know what, one day, I hope there's a pony who beats my records. Just, y'know, once I'm done setting them. Then I'll know we're doing something right."
"Oh." said Twilight.
"Wow," Pinkie's eyes swam. "That was sorta really kinda awesome."
"I try." Rainbow smirked and began spearing at the cake crumbs.
"Hmm, I suppose if I was an alicorn who dabbled in fashion, other designers might lose their unique perspectives and take to following blindly in my style, and only my style. While following the whims of fashion is usually a good thing, getting repetitive and same-y is, well, it becomes tacky and dull. I certainly see your point, Rainbow, though I might be able to take a break from designing every century or so to pursue my other passions..."
"Hey, Twilight! What about you? What would you do if you were asked to become immortal?" Pinkie began to stack their empty plates up, setting the three forks in a neat row on the top.
"Oh, well. First I'd find out what my friends think, and weigh up all of the pros and cons that they can find."
Three pairs of eyes were suddenly staring at her.
"So that's why the Princesses wanted you up in Canterlot!" Rarity finally broke the silence.
"Th-they really said you could become immortal?" Rainbow Dash leant forwards over the table. "Really?"
Twilight waved a hoof around. "They have a theory, but they're not sure if it will work yet. So it's more a 'maybe I could be immortal if I try it out'. Thing. Something. It's a big question."
"I'll say," said Pinkie. She gave a low whistle and tapped her chin. "What would you do with that big ol' heap of time, though? Crazy powerful magic thingamabobs? Ooh, read everything? Teach at Celestia's school? Become the next Nightmare Moon? No, wait! Go live in a cave away from society and become known only as 'The Hermit' or something and ponies make great journeys to seek you and your wisdom out but all you do is offer cryptic advice that proves really useful in hindsight and maybe you throw off your ratty old Hermit cloak every few hundred years when some big meanie like Tirek turns up and you completely annihilate them and leave everyone gasping in awe and then-"
"No, I don't think I'm going to live in a cave, Pinkie."
"Hmm, you're right. You'd end up in some mystical hidden library of mysticalness."
Twilight shook her head, but she smiled.
"Have our suggestions helped, darling?" Rarity pricked her ears and pursed her lips.
"Oh, yes! You've provided some interesting opinions. I still need to see Applejack and Fluttershy, though," Twilight twitched her wings. "I don't suppose any of you know if either of them are in town today?"
Pinkie Pie shrugged. "Sorry, I've been here all day and neither of them stopped by." She grabbed the empty plates and whisked them away through the door behind the counter, into the kitchen.
Rarity shook her head. "I saw Big MacIntosh at the apple stall today, so Applejack must be on the farm."
"I think Fluttershy was planning on picking up some stuff from the vet this afternoon if you wanna hang around for her." Rainbow began digging around for her bitpurse as Pinkie came pronking back with a slip of paper in her teeth.
"Oh, really? Thanks Rainbow, I'll try to catch her there." Twilight also began rummaging for bits.
Pinkie grinned as she set the bill down. "Friends' rates as always! You all heading out, now?"
"Oh indeed, I've a letter to Sassy on my desk that needs sending, and then I shall be having a brainstorming session," Rarity levitated a number of coins to the pink mare, and a generous share into the tip jar. "Do take care, Pinkie dear."
Rainbow Dash grinned. "And I've got to burn off some of this cake. Don't wanna stretch my suit too badly."
Rainbow and Twilight paid for their lunch, and then the three mares bid farewell to Pinkie.
Twilight paused outside the bakery for a moment to watch the others disappear. Then she let out a little snort and set off for the Ponyville Veterinary Practice, thoughts about endless days of wonder and stolen futures swirling in her head.
"Nope," said the receptionist with a light smile. "She hasn't been by yet. Feel free to use the waiting room, though."
"Oh, thank you," Twilight beamed back. "Actually, while I'm here, I'd like to make an appointment for my owl, he's due a check-up soon."
As Twilight and the mare behind the desk began to hammer out the details of date and time, a stallion with a cat left the examination room, and a mare with a foal and a puppy were called in. Twilight, satisfied with her plans, went to sit in one of the chairs that the small family had just vacated.
Her friends had raised some interesting points. If she was immortal, she would probably end up using all of that time to study and learn as much magic as she could. Would that mean that any other aspiring magicians would be put off by an alicorn who knew so much more than they could ever catch up to? Or would future generations be inspired by her and want to follow in her hoofsteps, as she had been inspired by Celestia's raising of the sun, all of those years ago as a filly?
"Hello, Twilight!" Fluttershy's soft voice cut through Twilight's thoughts. "What are you doing here? Oh goodness, is Owlowiscious alright?"
"Huh?" said Twilight. "Oh, hey Flutterhy, it's okay! Owlowiscious is fine, I was actually here to find you."
"Oh?" said Fluttershy, tilting her head slightly.
"Rainbow said you were picking up some supplies?" Twilight twitched her wings, and Fluttershy nodded. "Anyway, it's nothing major, I just wanted to ask you a question."
"Yes, anything. I mean, not anything but, um, you know what I mean."
Twilight giggled. "I just wanted to know what you would say if somepony offered to turn you into an immortal alicorn princess. Yes or no, and why?"
"Ah," Fluttershy wavered. "I'd say no, I think. If I was a princess there would be so many ponies. Ponies who would be looking up to me, or asking me questions or, or, just, expecting things. From me. I would love to be able to care for my animals and never worry about l-leaving them behind, but... "
Fluttershy's eyes were wide as she tried to find the right words.
"It's a lot of responsibility?" Twilight suggested.
"Oh, yes. I would never be able to do what you do. Having one of the thrones at your castle is already enough for me. Ruling over ponies as a princess, though? Goodness, I could never." Fluttershy lifted a hoof to her mouth
"So the responsibilities that would inevitably come with a position like that might be too intimidating and strenuous to be worth it?"
"Yes, that's exactly it," Fluttershy glanced towards the desk. "Was that everything you wanted to ask? Only, I really do need to get those medical supplies..."
Twilight's ears pinned back, and she gave a sheepish grin. "Yep, that's it! Thanks, Fluttershy, I won't delay you any longer. Have a good afternoon."
"You too, Twilight!" said Fluttershy, who turned and trotted over to speak with the receptionist.
The purple mare chuckled as she exited the building. Really, had she expected anything else from her timid friend? At least there was only one more pony to ask today.
Twilight had taken to the sky on her way to Sweet Apple Acres. It felt good to get the wind through her feathers, and feel the breeze pull back her mane. Of all the things being an alicorn had given her, the ability to fly was probably her favourite.
The town of Ponyville was spread out before her, the buildings radiating out from Town Hall in haphazard circles. Her castle glittered somewhere behind her, and if she turned around she'd have a clear sight all the way to Canterlot. However, Twilight's sight was fixed firmly ahead, at the rolling hills to the South of the town that were covered in a rich carpet of green trees. Applebuck Season was still a few months away, but the earth pony magic of the Apple Family kept at least some fields in various states of fruit production all year, bar the winter months. Twilight glided along, dipping low enough to see if any of the trees bore the tell-tale red of ripe apples.
If Applejack was on the farm, chances were that she'd be in one of the fields where harvesting would be possible. Twilight drifted West, over a grove of trees in bloom. The sweet aroma of apple blossoms hit her nose, just as a flash of orange caught her eye a few fields over. Twilight grinned, her quarry in sight, and spiralled down to land near her farmer friend with a thump.
"Hey, AJ!"
"Whoa," Applejack started slightly, then broke out into a broad grin. "Well, howdy sugarcube, what can I do you for? Early night did ya good?"
"Yep, all better now. I've actually got a question for you, if you're not too busy." Twilight said.
"Shucks, Twi, if ya came all the way out here to ask me somethin', least I can do is listen. Shoot." Applejack shifted one of the collection baskets to the side a tad and flicked her tail.
"Okay," Twilight giggled. "Firstly, that new cider cake you helped Pinkie make? The best cake I've ever had."
Applejack tipped her hat. "Mighty kind of ya to say, Twilight! Me 'n' Pinkie should collaborate more often."
"You definitely should. Anyway, I just wanted to ask, if somepony gave you the option, would you say yes or no to becoming an immortal alicorn?"
Applejack studied Twilight for a few moments. "This why Princess Celestia asked you up to Canterlot, then? Gave you an offer."
"Yep," Twilight swallowed. "So I've been trying to see what everypony thinks - what they would do in my horseshoes. To try and find the reasons why, or why not, that resonate with me."
"Huh. Gimme a moment to think about this," Applejack said, her eyes dropping to the ground. She pawed with one hoof at the grass, slowly. "What did the others say?"
"Starlight and Fluttershy both said they'd refuse because of all of the responsibility that would be expected of them. They're afraid that they'd either misuse the power it gives them, or otherwise disappoint the ponies relying on them as a leader, which the positon as an immortal princess would bring. Pinkie and Rarity would say yes, because they both value the rewards that never running out of time would afford - all of the experiences and possibilities that a life like that could offer. Rainbow also said no, because she doesn't want to get in the way of the dreams of future ponies. Spike would want me to say yes, as dragons are also incredibly long-lived, and Cadance said she wants to wait for more information before she can make a decision, and that it'll be based on her family," Twilight bit her lip. "They're the only ones I've asked so far."
"Huh," said Applejack again. "Well, Twilight... I ain't gonna pretend that I know exactly what your priorities are, but if it were me, I'd've already agreed."
"What? Really?" Twilight cocked her head. "I thought, um, I mean, uh. Y-your family is, um, I mean-"
"Ya thought I'd say no so I wouldn't have to lose 'em," said Applejack. Her mouth pulled into a sad smile. "I know what you were thinkin' Twi, but the truth is, I've already lost some of my family."
The orange mare looked up at the closest tree.
"It was one o' the hardest times in my life. Nothin' can prepare ya for somethin' like that until it happens."
Twilight floundered for a few seconds. "I, uh, you don't have to-"
"It's okay, hun, I've made my peace with it. Still hurts, it always will, but I can live with it. Now, y'see, I also know that one day, Granny ain't gonna be there either. One day she'll slip into a nap and never wake up. One day Big Mac'll hang up his yoke an' never put it back on again. I'm gonna see my little sister get grey in her mane, an' maybe the same fer my own kids if I ever have any. The thing is, Twi, all of that is gonna happen, an' I'm planning on being there to see it anyway. My parents were gonna pass on anyway, even if they went sooner 'n they should've."
Applejack pulled her hat off her head and began to twist it between her hooves, still staring up into the branches of the tree before her.
"The thing is, Twi, things are always gonna happen. Accidents and injuries and the passing of time. Things happen to rip away the ones you love an' you can't do a gosh darned thing to stop it. But if I was immortal? Nothin' could rip me away. Nopony would ever have to mourn at my grave or feel that empty grief or cry themselves to sleep over me. If I could never die, why, I could take losing my family as the years pass, 'cause it'd mean they'd always have somepony. I could look 'em in the eye, tell 'em I'll never have to leave 'em, and it'd be true."
Applejack finally looked back towards Twilight, meeting her eyes with an almost defiant look.
"Ya do whatever feels right for ya, Twilight, but that's my answer."
"Wow, that's - thank you, Applejack." Twilight gulped once, and then cleared her throat. Applejack replaced her hat and gave herself a shake.
"No problem, sugarcube. Ya mind givin' me a hoof with the rest of the field?" The farm mare's grin had returned, and Twilight was glad for the change in subject.
Applejack's reasons had been a lot heavier than she'd anticipated, and now all of her previous notions were in turmoil.
"Oh, not at all! Just point me in the right direction and I'll get started."
"Can ya start on the next row over?" Applejack pointed to her left, and began to kick the tree they'd been standing by.
"Absolutely."
Twilight's quill hovered above the parchment, hesitant. She dithered for another few seconds before signing her name. It was written. Taking in a shaky breath, Twilight rolled up the page into a neat tube, jerkily wrapping a red ribbon around it. She held a few beads of sealing wax over a candle, and then pressed it to the scroll. Her magic carved a symbol of her cutie mark into the rapidly-solidifying wax, and then she dropped the scroll onto her desk.
Strangely out of breath, she found herself panting as she stared at the letter.
Shaking herself from her mounting panic, she called out once. "Spike!"
The contents of the letter were greetings, pleasantries, goodbyes, and one other word. The word that would determine her fate. With the parchment bound up in its scroll, she could almost imagine it was like some Shrewd Angles' cat of a word. The ink wouldn't be set on the page until Celestia and Luna unrolled it and read it for themselves.
"Yeah, Twilight? What's u- whoa!" Spike came barrelling into the room, almost tripping over some of the discarded drafts that Twilight had screwed up and tossed aside.
Twilight caught him in her telekinetic grasp. "I need you to send a letter to Celestia."
Spike's slitted eyes locked onto the scroll. "Is that what I think it is?"
Twilight snorted. "It's about time I give them a solid answer. I don't want this hanging over me any more."
"So, what did you say?"
Twilight only smiled in response.
Author's Note
WELL it's finally finished! At a considerably higher word-count than I expected. 
So, do you think Twilight made the right decision? Do you think her friends have good reasons for the hypothetical choices that they made? 
Personally, I'd jump on the chance, and I suppose that might shine through in some places in the story.
Hope you enjoyed!
